JavaScript Minifier
Minify JavaScript by removing unnecessary whitespace and comments for a smaller output.
This tool runs entirely in your browser. Your files are never uploaded to a server.
function greet(name){return 'Hello '+name;}What this minifier does
Removes recognized line and block comments, collapses whitespace, and trims space around common JavaScript punctuation. Quoted strings, template literals, and escaped characters are preserved by the character scanner.
How to use it
Paste code, review the output that updates immediately, and copy it when ready. Reset clears the editor; the tool does not create a file or source map.
Important limitations
This is not a JavaScript parser, bundler, compiler, mangler, or standards-aware minifier. It does not rename identifiers, remove unreachable code, combine modules, validate syntax, or understand regular-expression literals and automatic semicolon insertion. Comment-like text, regex syntax, or line-sensitive statements can be interpreted incorrectly and change behavior.
Safe workflow and privacy
Keep the original and run tests plus a production-grade minifier before deployment. Compare behavior, not only file size. Processing is local in your browser and pasted code is not uploaded.
Frequently Asked Questions
- What does the JavaScript Minifier do?
- Minify JavaScript by removing unnecessary whitespace and comments for a smaller output.
- Does this JavaScript tool change program behavior?
- It only changes layout or removable whitespace. Review minified output before production use when code relies on unusual syntax.
- Is my code uploaded?
- Processing is local and your code is never uploaded.